diff --git a/chrome/ShyFox/shy-global.css b/chrome/ShyFox/shy-global.css
index 9099dc1..497a9b3 100644
--- a/chrome/ShyFox/shy-global.css
+++ b/chrome/ShyFox/shy-global.css
@@ -194,8 +194,8 @@ Styles for dialogs e.g. "confirm deleting extension"
     position: fixed;
     z-index: -1;
     
-    width: 100vw;
-    height: 100vh;
+    width: 100%;
+    height: 100%;
     
     left: 0px;
     top: 0px;